1243223516 has 12 divisors (see below), whose sum is σ = 2182730088. Its totient is φ = 619586352.

The previous prime is 1243223503. The next prime is 1243223519. The reversal of 1243223516 is 6153223421.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243223519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504971 + ... + 507426.

It is an arithmetic number, because the mean of its divisors is an integer number (181894174).

Almost surely, 2^1243223516 is an apocalyptic number.

It is an amenable number.

1243223516 is a deficient number, since it is larger than the sum of its proper divisors (939506572).

1243223516 is a wasteful number, since it uses less digits than its factorization.

1243223516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012708 (or 1012706 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 1243223516 is about 35259.3748668351. The cubic root of 1243223516 is about 1075.2672177966.

Adding to 1243223516 its reverse (6153223421), we get a palindrome (7396446937).

The spelling of 1243223516 in words is "one billion, two hundred forty-three million, two hundred twenty-three thousand, five hundred sixteen".